172057121 has 2 divisors, whose sum is σ = 172057122. Its totient is φ = 172057120.

The previous prime is 172057117. The next prime is 172057163. The reversal of 172057121 is 121750271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88078225 + 83978896 = 9385^2 + 9164^2 .

It is a cyclic number.

It is not a de Polignac number, because 172057121 - 2² = 172057117 is a prime.

It is a Chen prime.

It is equal to p_9611711 and since 172057121 and 9611711 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (172057321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86028560 + 86028561.

It is an arithmetic number, because the mean of its divisors is an integer number (86028561).

Almost surely, 2^172057121 is an apocalyptic number.

It is an amenable number.

172057121 is a deficient number, since it is larger than the sum of its proper divisors (1).

172057121 is an equidigital number, since it uses as much as digits as its factorization.

172057121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 172057121 is about 13117.0545855386. The cubic root of 172057121 is about 556.1913331891.

The spelling of 172057121 in words is "one hundred seventy-two million, fifty-seven thousand, one hundred twenty-one".